Chapter 1, Problem 20R

Explanation of Solution

Program code:

//include the required header file

#include <iostream>

//declaration of the function sumToN()

int sumToN(int n);

//define main function

int main()

{

    //calling function sumToN()

    int s=sumToN(10);

    //print the sum

    std::cout<<"sum="<<s;

}

//define the function sumToN()

int sumToN(int n)

{

    //create an integer variable sum

    int sum = 0;

    //iterate a for loop

    for (int i = 1; i <= n; i++)

        //add the value of i to sum

     ;&#...